Pooping blood...
I see what you are asking! Not for advice, her doctors are looking after her. You are hoping there may be someone this has happened to who can share their experiences.
That's not me! But I just wanted to send my best wishes.
Highest 290, Banded - 248 Lowest 139 (too thin!). Comfort zone 155-165.
Happily banded since May 2006. Regain of 28lbs 2013-14. ALL GONE!
But some has returned! Up to 175, argh! Off we go again,
I'm so sorry to hear what you and your sister are going through.
I did some searching, and it seems like a lot of the time the doctors assume it is from one of the intestinal joins that is bleeding more than average. They often give it a few days to clear up on its own, and then if it hasn't stopped they do further investigation. I've found several posts from members here who said they were kept a few extra days for bleeding, it stopped, and they were released to go home.
You definitely have the right to get an explanation for what they think is going on and how they have decided to handle it though. The nurses may know, so I'd talk to them first, but if they can't give you a clear enough explanation, insist on talking to someone who can asap.
I hope that all goes well and this resolves soon. I'll keep your sister in my thoughts.